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is a significant concern for physicians. Central9 g) H: \: K h4 j- ~8 g+ |3 R9 J
precocious puberty (CPP), which is mediated
% d$ b. {6 L1 U/ E% s$ t% r% h1 Y! {through the hypothalamic pituitary gonadal axis, has
3 q6 @+ X& r! C; j- Ia higher incidence of organic central nervous system
. i8 `% @4 T- X# J# X* Slesions in boys.1,2 Virilization in boys, as manifested8 w2 D7 M* O F; W( u+ T
by enlargement of the penis, development of pubic
. W( L) G! K0 `7 G" j1 x4 Lhair, and facial acne without enlargement of testi-
z6 T9 b" Z! q9 R' p! Y; Bcles, suggests peripheral or pseudopuberty.1-3 We
" t2 U& w" r: Treport a 16-month-old boy who presented with the, p- i, {- V9 C5 f9 C( c4 ^! d
enlargement of the phallus and pubic hair develop-
9 {. i& ^* k+ y0 Z# M f- s: fment without testicular enlargement, which was due) Y) u* J& {( k
to the unintentional exposure to androgen gel used by& C# D" N9 V1 [9 R) \
the father. The family initially concealed this infor-8 u8 w$ \/ [% L6 |& J
mation, resulting in an extensive work-up for this
" s2 k1 M @7 E: j9 s7 d9 Xchild. Given the widespread and easy availability of
( N( x1 ~$ }: X9 Ktestosterone gel and cream, we believe this is proba-
' k& f7 F- T7 r4 T7 P6 V V0 G+ Dbly more common than the rare case report in the
% t$ m, M% o+ b2 Y" P, |" e( g) c. Iliterature.4
7 V5 m" P4 ^' b8 V5 S |Patient Report" r% @0 W1 |/ u1 S3 _/ ]
A 16-month-old white child was referred to the2 |3 q. @, _* [: v( e( a0 [8 |
endocrine clinic by his pediatrician with the concern
5 I9 @9 \/ N8 {* I7 E4 f f4 Jof early sexual development. His mother noticed
. V6 H9 G- U4 v' d: plight colored pubic hair development when he was
/ r& r% t2 ~& p2 C: P; P8 gFrom the 1Division of Pediatric Endocrinology, 2University of
( J* k" q/ o# O& [South Alabama Medical Center, Mobile, Alabama.; X3 C9 h, I/ W) v0 L {" S) n
Address correspondence to: Samar K. Bhowmick, MD, FACE,
( L# A% |3 l( j. d+ ^' l2 i! tProfessor of Pediatrics, University of South Alabama, College of
( L/ Q j" F4 O( o. U4 JMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;# h8 l: W5 t0 W% R- ~1 B( ]( F
e-mail: [email protected].
* U7 f' Y' c% y, @about 6 to 7 months old, which progressively became6 e2 [- m1 o8 l: m
darker. She was also concerned about the enlarge-
7 n3 p! Q1 H" O5 I$ A- Cment of his penis and frequent erections. The child
w* g( [- P& v' s. rwas the product of a full-term normal delivery, with
- f0 y6 E5 G5 P: `$ ma birth weight of 7 lb 14 oz, and birth length of
1 F! @# H0 S& S0 H" O+ D20 inches. He was breast-fed throughout the first year8 K, o/ p" G* H! b
of life and was still receiving breast milk along with( |% X! h$ R% q! E. `* b' l
solid food. He had no hospitalizations or surgery,
: r/ [! k" d; |- v4 yand his psychosocial and psychomotor development$ T* h0 [$ a8 Y. p# \! N
was age appropriate.$ ^" b' `8 C; Q' Q D8 o/ B$ A, K& l5 o A3 e
The family history was remarkable for the father,
$ r4 n) ~& C0 G. bwho was diagnosed with hypothyroidism at age 16,
5 n- f* V3 `3 `2 p* ?" q* Gwhich was treated with thyroxine. The father’s E j' M7 T% M1 ]
height was 6 feet, and he went through a somewhat
$ P4 }5 `' S# I+ w5 U+ i) V- Vearly puberty and had stopped growing by age 14.# l9 Y6 P0 @. T. b3 P
The father denied taking any other medication. The. X, A; ~. H8 A7 {1 _+ C0 Q( J! X
child’s mother was in good health. Her menarche4 q" n9 T- a0 b# p8 L
was at 11 years of age, and her height was at 5 feet
1 r7 _8 Q) Q6 M7 B Z$ f6 P" l' n5 inches. There was no other family history of pre-
8 f, O1 i8 K) v4 ?, ucocious sexual development in the first-degree rela-; }3 o9 ^2 _2 Q0 h
tives. There were no siblings.
+ `$ m, I0 C3 K5 |Physical Examination1 U- d- h3 s5 J) S3 v; z3 ]
The physical examination revealed a very active,
+ t: n$ A U, c( o) P- q6 w1 a% dplayful, and healthy boy. The vital signs documented
$ }) X0 v% m/ P& c# F# h$ va blood pressure of 85/50 mm Hg, his length was
K) f/ g8 M4 u% i3 Q90 cm (>97th percentile), and his weight was 14.4 kg2 C C6 X. l" z: `" h" L3 ]
(also >97th percentile). The observed yearly growth
4 ~) p% Y! e' a7 U0 Svelocity was 30 cm (12 inches). The examination of8 d& Q7 Q$ d6 r/ c* }# d7 k
the neck revealed no thyroid enlargement.
' m6 [% j: y/ [' |4 j: H& iThe genitourinary examination was remarkable for
0 L* K8 [( B5 k! k. Benlargement of the penis, with a stretched length of
) R' }. s( \ K r% Y+ k8 cm and a width of 2 cm. The glans penis was very well
# a/ U ]0 H+ J$ f$ q' kdeveloped. The pubic hair was Tanner II, mostly around. t3 H- [" p" @
5402 Q: ?6 ~% Q' j
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the base of the phallus and was dark and curled. The7 f: ]8 l: a( f+ Z% z
testicular volume was prepubertal at 2 mL each.* s$ p8 e9 g. s0 c) v! S
The skin was moist and smooth and somewhat
' E6 p) |# X3 c4 |oily. No axillary hair was noted. There were no$ z8 C0 v) @, U
abnormal skin pigmentations or café-au-lait spots.
) K! j4 `: ]4 f. y1 ?Neurologic evaluation showed deep tendon reflex 2+
3 V3 f. K. @4 v a6 R( h# w4 L; a( Hbilateral and symmetrical. There was no suggestion1 X/ c; l0 H% B$ d: t8 L4 J8 w" r, c
of papilledema.
$ P5 w0 i Y8 [8 wLaboratory Evaluation
4 `5 W, P: K, s G- EThe bone age was consistent with 28 months by
3 l2 C' D l" Tusing the standard of Greulich and Pyle at a chrono-" }9 U/ W$ u1 [! j% C3 } z6 h! H
logic age of 16 months (advanced).5 Chromosomal
9 d9 Q% j% V' Ykaryotype was 46XY. The thyroid function test
L0 i0 i8 R/ d' bshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
N' q. U0 [6 r3 _1 I2 xlating hormone level was 1.3 µIU/mL (both normal).
E7 b. m2 M: q! |& z+ q2 YThe concentrations of serum electrolytes, blood6 E N( A# {$ q$ _& A0 E' j
urea nitrogen, creatinine, and calcium all were% E) Z2 e4 S; x7 @7 F
within normal range for his age. The concentration; o; h) o/ s' J
of serum 17-hydroxyprogesterone was 16 ng/dL
; ~- G( |0 U& b8 p6 j(normal, 3 to 90 ng/dL), androstenedione was 20
% X7 Y: _$ C- H; _* r) V; fng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-6 T) O9 G/ h2 N- I0 I4 @3 W9 L* z
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
# H$ O0 b( [0 _: b6 ^, f: A# Wdesoxycorticosterone was 4.3 ng/dL (normal, 7 to8 a8 G8 t. D, e" J+ {
49ng/dL), 11-desoxycortisol (specific compound S)- Q/ H$ P! W! t/ N* x8 L
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
8 |# k$ F+ v o1 h6 F# atisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
3 Z) D- c; A4 i/ [# v. v9 S ?testosterone was 60 ng/dL (normal <3 to 10 ng/dL),1 j _) A j- N( T( H
and β-human chorionic gonadotropin was less than1 E( n- ]* G7 C! c2 s0 R
5 mIU/mL (normal <5 mIU/mL). Serum follicular$ R0 o: q- i0 |
stimulating hormone and leuteinizing hormone
+ O3 {/ n# \" ~8 V7 d7 k- Aconcentrations were less than 0.05 mIU/mL6 b y5 Q' p" V9 Z( \% q0 v
(prepubertal).
" X- x7 P: v: H" P) {! P7 u$ O8 ZThe parents were notified about the laboratory
: u. Z* l+ {3 E6 H3 n: ?results and were informed that all of the tests were& T7 D8 |% S! J8 ~. D1 }
normal except the testosterone level was high. The
2 ^. v' P# `2 Wfollow-up visit was arranged within a few weeks to
+ I" _4 Q! R* Y% `) _+ G/ g jobtain testicular and abdominal sonograms; how-
/ D# X0 n( t' W/ @ever, the family did not return for 4 months.
# w: z4 I: l) m$ p; C8 lPhysical examination at this time revealed that the
* u% T. M+ a- {2 q0 vchild had grown 2.5 cm in 4 months and had gained( a9 F' m$ _" @) l0 V
2 kg of weight. Physical examination remained
' Z2 x$ X6 X2 u: k" wunchanged. Surprisingly, the pubic hair almost com-/ g" n4 \, S s+ R/ {+ F
pletely disappeared except for a few vellous hairs at; v0 s/ i" w; A# T2 t$ i
the base of the phallus. Testicular volume was still 20 Y4 A5 w9 c) L. @
mL, and the size of the penis remained unchanged.; B x" r9 C9 m) x( ?& J8 f- _/ \
The mother also said that the boy was no longer hav-/ c/ c7 K- a% o) P3 r% e
ing frequent erections.& c$ j2 M3 @- W3 b, k' }
Both parents were again questioned about use of
8 P3 r+ a9 R4 ~any ointment/creams that they may have applied to! j6 o5 n- b9 D8 L, H
the child’s skin. This time the father admitted the" W" j& A ]" k5 s
Topical Testosterone Exposure / Bhowmick et al 541" _- L, v- u" k( I4 I
use of testosterone gel twice daily that he was apply-
9 t% h8 g* M9 M V' \# c' o; u/ ]ing over his own shoulders, chest, and back area for
3 b6 k, G1 D# g- U% E va year. The father also revealed he was embarrassed
& b$ B; Z6 v5 qto disclose that he was using a testosterone gel pre-
$ W/ i- V& {$ M. {$ S0 X' g/ mscribed by his family physician for decreased libido
; Z1 a) I- r6 V" P* H2 ysecondary to depression.( ~1 \+ Z" J- Z0 B% o- |3 F3 s
The child slept in the same bed with parents.
" ]( q3 W: Z2 i8 ` q9 }7 pThe father would hug the baby and hold him on his" j7 O3 w# d" U% E! a
chest for a considerable period of time, causing sig-$ F5 h5 l; o% q
nificant bare skin contact between baby and father.
9 {, @: ~' h; DThe father also admitted that after the phone call,2 w8 R, A0 A- u+ X! D
when he learned the testosterone level in the baby
: U2 _/ I+ \; Hwas high, he then read the product information ~( R3 M: \5 x5 m& q* i, i( K
packet and concluded that it was most likely the rea-7 }0 x/ a6 i* g) N" y
son for the child’s virilization. At that time, they( ~) l+ @" q. Q: E! O
decided to put the baby in a separate bed, and the/ w! M8 k2 [0 y
father was not hugging him with bare skin and had
. Y4 q8 s9 I; G+ A( N; L( K( O/ pbeen using protective clothing. A repeat testosterone
% V, d4 E N% {8 O, btest was ordered, but the family did not go to the
' b/ K, y# B6 }/ ylaboratory to obtain the test.) [, D1 R. k3 G" [
Discussion l. j4 L, x7 v* r7 \
Precocious puberty in boys is defined as secondary
; I4 w X. F% [# Z9 s- ?sexual development before 9 years of age.1,4
4 ]5 A, H7 \% M9 H |7 L8 R+ K% XPrecocious puberty is termed as central (true) when
* c& M4 c) d4 H* W" W, m1 C0 ^it is caused by the premature activation of hypo-% y5 ?4 h& E" |! J) @' x
thalamic pituitary gonadal axis. CPP is more com-
9 _$ `8 ~; V M+ d, W3 ?+ ?0 Wmon in girls than in boys.1,3 Most boys with CPP0 i! O# i+ I8 X8 f
may have a central nervous system lesion that is
0 ~1 e x9 H. Yresponsible for the early activation of the hypothal-( S% a& k: E& P( Y: g0 t# {
amic pituitary gonadal axis.1-3 Thus, greater empha-
9 i3 L# m5 E& @ J1 ^sis has been given to neuroradiologic imaging in
4 _! @ J( c" e4 uboys with precocious puberty. In addition to viril-- \0 L, ]4 x# I, P
ization, the clinical hallmark of CPP is the symmet-2 a8 }: t3 I0 W5 @: n* _
rical testicular growth secondary to stimulation by
; g* G5 V4 h2 T3 {gonadotropins.1,3
V: Z/ W$ y' E1 {2 t* QGonadotropin-independent peripheral preco-$ p @) L; D* X. l' \
cious puberty in boys also results from inappropriate! ?' l/ B; o! L5 e: J/ _, e
androgenic stimulation from either endogenous or( q1 N1 M% l4 d6 h- n5 i
exogenous sources, nonpituitary gonadotropin stim-+ [- v+ R4 D+ ~& @" J- W) a
ulation, and rare activating mutations.3 Virilizing
) ^6 H9 H2 K% o# Ucongenital adrenal hyperplasia producing excessive
4 V$ b$ x8 I. J, ?% p2 Jadrenal androgens is a common cause of precocious. Z& h6 s! _. d; A/ X: p
puberty in boys.3,4/ j3 @* U, S/ q: O
The most common form of congenital adrenal: G1 ~! t; W7 o$ M6 X
hyperplasia is the 21-hydroxylase enzyme deficiency.1 a) H; h6 X$ B8 v
The 11-β hydroxylase deficiency may also result in
! F7 w$ `' p4 q* ]7 Iexcessive adrenal androgen production, and rarely,
9 Z2 s8 M. w1 Ban adrenal tumor may also cause adrenal androgen% ]+ X. W# {' K! M' l
excess.1,3
/ x4 C" q* F; z0 C9 @at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from. \: x% w' G, G3 v/ ~3 Y& |& r
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007$ Q1 p6 z) v- G# O0 g7 g2 U7 z- e3 l
A unique entity of male-limited gonadotropin-3 ^! T2 q0 b7 ?
independent precocious puberty, which is also known
, N1 E7 g q$ _as testotoxicosis, may cause precocious puberty at a! ]+ J) G' ?9 X# v4 @$ l
very young age. The physical findings in these boys
$ A! i% j" j8 ~" ~" M$ _with this disorder are full pubertal development,
5 I4 y- {) J* n* M8 [0 }; uincluding bilateral testicular growth, similar to boys+ n" }$ A- ?! ]+ L# o
with CPP. The gonadotropin levels in this disorder
/ F/ o. C$ Y- A4 oare suppressed to prepubertal levels and do not show7 e# o* f3 j7 a" U6 B' h2 j
pubertal response of gonadotropin after gonadotropin- @0 D+ W4 v7 J6 Y5 j4 P4 r8 d
releasing hormone stimulation. This is a sex-linked$ E4 O6 V% W" a1 K8 `, k; L
autosomal dominant disorder that affects only
* ]* ^% C+ E1 F! }& a) Mmales; therefore, other male members of the family
6 a2 _, |5 D$ ?3 x$ y) Z! umay have similar precocious puberty.39 m0 v) W4 V5 S5 S
In our patient, physical examination was incon-9 V3 g! `* e& F" s J
sistent with true precocious puberty since his testi-. L% i4 H1 m4 k- U
cles were prepubertal in size. However, testotoxicosis5 d8 F [7 F5 h( h0 X$ X
was in the differential diagnosis because his father
2 k ~9 V& M5 C4 f0 fstarted puberty somewhat early, and occasionally,
+ ^8 k+ x0 | i% {testicular enlargement is not that evident in the. C" ~: Q' x' l, |' @0 ]: j
beginning of this process.1 In the absence of a neg-, Z4 ?) g$ o V# T% a
ative initial history of androgen exposure, our6 I8 h% W8 K+ q
biggest concern was virilizing adrenal hyperplasia,1 t; r8 M, z% A& D
either 21-hydroxylase deficiency or 11-β hydroxylase
$ I! [5 `( l! J7 Sdeficiency. Those diagnoses were excluded by find-# M4 E0 i9 G- M8 e. u
ing the normal level of adrenal steroids.6 N9 b4 y/ L; D% `
The diagnosis of exogenous androgens was strongly' E6 D& i0 h! M7 j' p
suspected in a follow-up visit after 4 months because" n# W" ]; I$ C2 i
the physical examination revealed the complete disap-; h( o3 m. A, @% v W
pearance of pubic hair, normal growth velocity, and
) ? D% O; F9 D( d: K M5 Udecreased erections. The father admitted using a testos-
* O3 p' |7 ]0 bterone gel, which he concealed at first visit. He was
6 k6 i& ^8 h0 C: [% [using it rather frequently, twice a day. The Physicians’
6 \6 j+ N& t2 J! h2 h- U4 V# ADesk Reference, or package insert of this product, gel or5 c6 G3 K1 J* m) x
cream, cautions about dermal testosterone transfer to
$ {( `2 N" D4 z' Qunprotected females through direct skin exposure.
$ `/ f6 j s, l. o9 k0 S6 i! K3 lSerum testosterone level was found to be 2 times the# F0 U$ k* R+ \1 Z% u
baseline value in those females who were exposed to
: Y$ _5 @) |1 z, U# `1 Qeven 15 minutes of direct skin contact with their male
* E( a: Z# i# D; V/ C; b) _partners.6 However, when a shirt covered the applica-
6 p5 l5 M) g8 ^# Dtion site, this testosterone transfer was prevented.
" v g) `3 y3 L4 d% EOur patient’s testosterone level was 60 ng/mL,0 \& e: \6 [6 D9 X% B( S
which was clearly high. Some studies suggest that& W) ]6 R" ~6 f% T
dermal conversion of testosterone to dihydrotestos-; Y {& E1 R+ p T# e
terone, which is a more potent metabolite, is more
& n. u0 c+ a/ s3 c) l. N. B: m7 i2 jactive in young children exposed to testosterone
; s* }2 ?, B: z2 P! j( Vexogenously7; however, we did not measure a dihy-
0 b* M) F7 G) ~* L& s3 L- Odrotestosterone level in our patient. In addition to
/ m: S$ T; u" r: Y0 z4 tvirilization, exposure to exogenous testosterone in
4 i- g" }+ T7 |7 n8 R C( Lchildren results in an increase in growth velocity and1 e; s' R, _3 y; C
advanced bone age, as seen in our patient.- o4 b8 G+ j9 }7 Q1 ]( N
The long-term effect of androgen exposure during. C$ C7 b! V0 F/ Q! g9 Q. Y
early childhood on pubertal development and final
S& @- n8 M5 M1 Wadult height are not fully known and always remain
* H0 v. @3 Z8 M. h3 ta concern. Children treated with short-term testos-
* M5 [! C' L3 w6 P: E, Y2 Tterone injection or topical androgen may exhibit some
1 z Q& K8 C1 F2 Qacceleration of the skeletal maturation; however, after
5 t5 I* g8 ?) R+ x! ycessation of treatment, the rate of bone maturation4 A6 L {* E7 ]4 [/ v+ n+ M# |
decelerates and gradually returns to normal.8,96 ?# d/ g1 i6 ^- P4 m' C
There are conflicting reports and controversy
! `9 J: t" r% iover the effect of early androgen exposure on adult
( |! w* N" ~! @( d/ a! \penile length.10,11 Some reports suggest subnormal
9 k! E& o4 ?! E$ e" x: p* J1 @4 hadult penile length, apparently because of downreg-' @3 x$ Y5 Y) }- D$ [6 r
ulation of androgen receptor number.10,12 However,& x; Z6 g9 {2 y- d4 ?: s1 U
Sutherland et al13 did not find a correlation between( m. r G) O5 U/ U3 Z
childhood testosterone exposure and reduced adult
1 Z) t. b8 j' J+ Y2 n+ k* Rpenile length in clinical studies.
8 b r% g, s- j* b# dNonetheless, we do not believe our patient is' }' b1 O+ x* b* A' G. h' U
going to experience any of the untoward effects from/ {% e& s2 Z d$ T3 [; ?0 s4 g1 S
testosterone exposure as mentioned earlier because" e' W; ?: {' n6 t3 o2 k
the exposure was not for a prolonged period of time.
! }$ a$ K( d NAlthough the bone age was advanced at the time of6 J+ c9 n" f0 L& w5 i
diagnosis, the child had a normal growth velocity at
& D& V* ~* d% ^7 j6 ithe follow-up visit. It is hoped that his final adult/ _+ i1 l6 i& [. i
height will not be affected.8 I& {5 k Z( F5 s5 P
Although rarely reported, the widespread avail-1 K& ^. R$ D- C' j8 u, B
ability of androgen products in our society may
% {2 D( O3 D% \4 f3 Tindeed cause more virilization in male or female
) V; F: C# H5 Schildren than one would realize. Exposure to andro-
- l" W: _% L: x- _8 N; Lgen products must be considered and specific ques-" Z5 c4 M2 _5 v9 x1 l! \# w" j
tioning about the use of a testosterone product or& V) Y7 K4 Z d4 \# }
gel should be asked of the family members during
1 O8 Y- D9 s6 J$ ]the evaluation of any children who present with vir-% i: i; |5 o/ u" u& v: W5 p4 [
ilization or peripheral precocious puberty. The diag-
; b1 S4 i+ v, L- ]3 j: Lnosis can be established by just a few tests and by
& O/ h; X3 L, T* sappropriate history. The inability to obtain such a3 C7 S1 N. I3 @ l$ n% t
history, or failure to ask the specific questions, may+ o z0 ~3 w: R$ ]# w4 M
result in extensive, unnecessary, and expensive
1 [& w3 L) Z6 t; ` ninvestigation. The primary care physician should be
2 x0 z# ^! T7 @ y6 h4 \aware of this fact, because most of these children
2 H7 t6 u( l" ^& |5 hmay initially present in their practice. The Physicians’
4 A3 [0 q$ m2 m. T& {Desk Reference and package insert should also put a
+ u! l$ ~8 l W+ gwarning about the virilizing effect on a male or \( r% X) v' R
female child who might come in contact with some-; N4 S. {3 K2 x; `3 D& i$ f% P
one using any of these products.4 j8 D7 a2 N) Z! k/ K( L+ X2 ~
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* ?( h. u, x' ~% f/ Stestosterone and gonadotropin. J Urol. 1978;119:
- v% q0 `- a1 {667-668.
8 s! B6 a/ z9 s: C0 M, `. n4 ?8. Guthrie RD, Smith DW, Graham CB. Testosterone
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